Ventilating screen



H. H. EVERHARD VENTILATIN Jan. 11 1927.

G SCREEN Filed August 17, 1922 Patented Jan. i1, 1927.

I UNITED. STATES mam: n, nvnnnmn, or CANTON, on'Io.

v'an'rmrme seamen.

Application filed August 1?, 1m. Serial in. 582,487.

This invention relates to ventilator screens and more particularly to an adjustable screen I of sheet metal frames 'slidably connected together, one frame having a U-shaped channel which slidably engages the edge portion only of the other frame each of the frame yielding groove having straight, parallel members being provided with a rigid nonwalls, and co-planar flanges extending each way therefrom, the screen fabric being pressed into said grooves by means .of rods or wires preferabl round in cross section, and preferably of -shape to allow for compression of the fabric as the wires or rods are forced into the grooves, the compressed fabric wedging the wires or rods in place in the grooves and holding them against displacement.

The above and other objects may be attained by constructing the device in the ,manner illustrated in the accompanying drawing, which-'-.

Figure 1 is a front elevation of a ventilator screen embodying the invention; Fig. 2, a top plan view of the same;

Fig. 3, an enlarged section on the line -3, i

Fig. 4, an enlarged section on the line 4-4, Fig. 1; and Fig. 5, a detail perspective view of aportion of one of the frames showing one of the ,stops for limiting the closing movement-of the frames. Similar numerals refer to similar parts throughout the drawing. The screen consists essentially of two frames 1 and 2, which are slidably connected together, whereby the screenas a whole may expand or contract to accommodate window frames of various sizes. Each ofsthese frames is preferably formed of sheet metal,

' the frame 1 having the upper and lower edges bent inward and terminatiiig in the substantially wide U-shaped channels 3, while the frame 2 has oppositely disposed j U-shaped channels 4 formed at its upper and lower edges, said channels terminating at a point spaced from the channels'3, as indicated at 5, the free flange edges of'theupper and lowerchannels 3 engaging in the bottom of the channels l, this beingthe only point directly into the groovesof contact between the frames 1 and 2.

steel or other corrosive metal, the narrow edge sliding contact of the frames limits to a minimum the resistance which may be caused by a corrosion of the metal; and if the metal is coated with paint or enamel, the width of the groove, which is cut inthe enamel to expose the metal, is limited to a narrow. line, as distinguished from a wide band, which may be cut by a greater'width of contact.

When a wide contact is made between such sliding frames, a corresponding wide band of metal is exposed by the sliding and abrading action of the frames and thesame corrodes or rusts by exposure to the weather and renders it difficult to slide .'one "frame upon the;v other.

The v narrow edge sliding contact of-the frame uides of the present improvement limits the abrasion of paint or enamel to a narrow'vline, which generally remains bright or free from corrosion, and at any event the resistance of rust is readily overcome.

The end members 6 of each of the frames 1 and 2 are preferably provided with the back turned edge portions 7 for the purpose of strengthening the frame. A straight groove 8 is providedzzentirely around each frame member 1 and 2 in one side thereof, the side walls of'the groove being straightand parallel as shown, and being extended in opposite directions fromthe mouth of the groove to form substantially co-planar flanges 1, 1 and 2, 2* in the face of the frame member. The sheet met-a1 from which the frames are made, is of sufiicient thickness to provide rigid, unyielding walls in these grooves.

, The fabric 9 which forms the screen is preferably a textile fabric and in assembling the same upon the screen, the fabric is stretched tightly across each frame and a wire .or rod '10, preferably round in cross section, is forcedfdown into each of the Figs. 3 and 4, the diameter of the wire or rod 5 being so proportioned as to wedge and comshown in Fig. 1, in order to allow slight movement between the two rods in each frame, as the same are wedge pressed The insertion of the U-shaped rods in the 'rooves 8, ,uponthe fabric as best shown in ened at the corners to a much frame groove along one end and part of each side thereof, not only serves to stretch the fabric tightly across the frame, but when the rod is pressed and wedged into the groove, it cooperates with the frame to strengthen the same and stillens' the corners thereof;

When -a wedging rod is-formedwith one angle so as to extend along two sides of the frame there is a substantial stiffening of the angle thereof; and When 'a wedge rodv is formed with two angles so as to extend in the groove across one end of the frame, and part way along the grooves in two sides thereof, the frame is strengthened and stiffgreater extent, because of the U-shape of the bar.

lVloreover, the co-planar face flanges stay and strengthen the side walls of the groove, and render them rigid against lateral deflection, in the median portion as well as in the corner portions of each side of the frame member; and this strength and rigidity is especially important on the inner sides of the groove, to withstand the pull of the tensfoned screen fabric throughout the entire length of each side of each screen member.

For the purpose of limiting the opening movement of the screens, the screen 1 is provided at its inner end with one or more stop members 11 attached to the adjacent. end member 6 of the frame, as by tangs 12 which enter slots 13 in the en member, an outturned flange let being provided for engaging the adjacent end wall of the frame member 2 to limit the opening movement of the screen. J

-lt will be evident from the above that an extensible ventilating screen is provided in which the fabric is tightly stretched across each frame of the screen and-held in position by means of the round rods or wires, which are pressed into the straight rigid grooves upon the fabric.

It will also be seen that the two frames may be easily adjusted with referenceto each other as the only contact between the two frames is the sheet metal edge of the one frame engaging the U-shaped channel of the other frame, thus roviding a minimum of friction in the sli ing movement of the frames.

It is obvious that a screen constructed in the manner above described, will have a'neat and pleasing appearance, as the rods in each framear'e located upon the same side of the screen as best illustrated in Figs. 1 and 3, thus giving the entire screen a uni form a )pearance and permitting the finished side 0 each frame to be placed upon the inside of the window. V

I claim 1. An extensible screen including a pair of sheet metal frame members, rounded U-shaped channels at theupper and lower edges of one frame, and flanges on the upper and lower edges of the other frame having theiredge portions only in sliding contact within the bottom of the U-shaped channels,

2. An extensible screen including a pair of sheet metal frame members, rounded 'U-shaped channels at the upper and lower edges of one frame, and oppositely disposed U-shaped channels at the upper and lower edges of the other frame, the free edge portions only of-one set of channels being in sliding contact within the bottom of the other set of channels.

3. A screen frame made of sheet metal formed with a groove in one side extending around the frame and having a flange extending inward from, the mouth of the groove in the face of the frame, a screen fabric on the same side of the frame extending across the groove, and rods upon the fabric wedge pressed directely into the grooves stretching the fabric on the frame and clamping it in the groove. 1

4. A screen frame made of sheet metal .formed with a groove in one side extending around the frame and having flanges extendingin opposite directions from'the mouth of the groove in the face of the frame, a

screen fabric on the same side of the frame extending across the groove, and rods upon the fabric wedge pressed directly into the grooves stretching the fabric on the frame and clamping it in the groove.

5. A screen. frame made of sheet metal formed with .a groove in one side extending around the frame and having a flange extending inward from the mouthv of the groove in the' face of the frame, 'a screen fabric on the same side of the frame extending across the groove, and rods upoi1 the fabric wedge pressed directly into the grooves stretching the fabric on the frame and clamping it in the gr0ove', each rod including an angle strengthening and staying the corresponding angle of the frame.

6. A screen frame made of sheet metal formed with a groove in one side extending around the frame and having a flange extending inward from the mouth of the groove in the face of the frame, a screen fabric on, the sameside of the frame extending across the groove. and rods upon the fabric wedge pressed directly into the grooves stretching the fabric on the frame and clamping it in the groove. each rod including two angles for strengthening and .Etaying the corresponding angles of the rame.

l HARRY H. EVERHARD. 

